The gas will evnetually run out, so we can all ride around in these. It will also solve the obesity problem, which will eventually solve the health care problem.
To travel long distances, we can use high speed rail powered by electromagnets. That way, the only friction is air. Planes will be obsolete because for really, really long distances we will just email ourselves somewhere and get printed out in an organic 3D printer.
Also we will genetically engineer a tree that fruits perfectly marbled filet mignon, which will taste just like the real thing, but it will have the nutritional value of eating kale, spinach, blueberries, and whatever other super food.
Also, all the drinking fountains will be root beer!